Screw-spike.



D. L. BRAINE.

SCREW SPIKE. APPLICATION FILED APR.l8,l913.

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Patented Feb. 19, 1918.

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DANIEL L. BRAINE, on NEW YORK, N. Y., ASSIGNOR 'ro LAWRENCE F. BEAIN OF NEW YORK, N. Y.

SCREW-SPIKE.

Patented Feb. 19,1918,

Original application filed March 15, 1913, Serial No. 754,502. Divided and this-application filed April 18, 1917. Serial No. 762,074.

To all whom it may concern Be it known that I, DANIEL L. BRAIN a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Screw- Spikes, of which the following is a specification.

This invention relates to improvements in screw spikes, and has for an object to provide an improved form of screw spike especially adapted for use with the device shown in my prior Patent No. 1,081,575,

granted on my copending application, No. 754,502, of which this is a division. This application is also a continuation, as to all common subject matter, of my prlor application, Serial No. 754,501, which resulted in Patent N0. 1,083,270.

I have found it advisable, in connection with the rail fastening and supporting construction shown by my copending application, to provide an improved screw spike provided with means to strengthen or reinforce the head against outward bending, and to provide a cut-off head which will permit ready removal and replacement of a rail without requiring the entire withdrawal of the spike from the tie or other support.

Still another object is to provide a screw spike having a head with a helical under surface, preferably having the helix thereof opposite in inclination to that of the screw thread, to aid in following the rail base down when the latter wears down its support. Other objects will be made apparent and set forth in the following specification and accompanying drawings, in which Figure 1 is a perspective of the spike embodying my invention;

Fig. 2 is an inverted plan view of the head thereof;

Fig. 3 is a detail side elevation of the head in one position;

Fig. 4 is similar to Fig. 3 at right angles thereto;

Fig. 5 is a view similar to Fig. 4 at right angles thereto.

Like numerals refer to like elements throughout the drawings, in which 20 designates generally a screw spike having the threaded stem 20, upon which is formed the circular head 20 carrying the upper non-circular portion 20 adapted to be envice.

gaged by a wrench or similar operating de- The head 20 is provided with the helical under-surface 20 the helix thereof being opposite in inclination to the helix of the screw thread, 2'. 0., where, as shown in the drawings, the thread is right-handed, the helix of the under-surface 520 is 'left handed, and vice versa." The head is further partially cut away to form the plane surface 20 the lane thereof being approximately paral e1 to the axis of thestem 20% This forms a face which will permit; the rail to be placed or withdrawn without requiring entire withdrawal of the spike from the tie in which it is embedded, as will be apparent. Formed on the under side of the head 20 and extending around the stem 520 at the upper portion thereof, is the helical shoulder 20 terminating at one extremity at 20 The helix of this shoulder 20 is of similar inclination to that of the screw thread and is approximately equal in pitch. It will be noted that the helix of the shoulder E20 intersects the helix of the surface 20 and the latter is cut away, as indicated by the numeral 20 to provide for the continuation of the helical shoulder 20, as shown in Fig. 1. I have shown the end 20 of shoulder 20 as terminating forwardly of the face 20 for the purpose to be generally indicated below.

In the use of this spike I preferably employ a tie plate or similar device adapted to furnish a reinforcing shoulder for coaetion with the shoulder 20, which will travel in contact therewith as the spike is screwed downwardly to take up wear of the rail upon the supporting structure.

I have not thought it necessary to enter into a detailed description of the operation of this device, or of structure capable of use in connection therewith, since this is fully covered in my copending application mentioned above. I am also aware that this device is susceptible to changes in form and structure, and I do not wish to be restricted to the showing in the drawings, or description above, beyond the scope of the appended claims.

What I claim is 1. In a device of the class described, a screw-spike having a screw threaded stem and a head, said head being approximately circular and partially cut away in a plane under surface thereof, said shoulder being helically inclined, and the pitch of said helically inclined shoulder being approximately r of the screw,

, Copies of this patent'may be obtained for equal to that of said thread and in the same direction.

3."Ina device of the class described,

spike having a screw-threaded stem and a circular head, said head being cut away in a plane substantially parallel to the axis and provided with a helically inclined under side, the inclination of said under side being reversed with respect to the inclination of the thread of said stem,

saidrhead being provided with a shoulder on the under side thereof, said shoulder being also helically inclined,,the pitch of said inclined shoulder being approximately equal to that of the thread of said screw, both said I shoulder and said-thread being inclined in the same direction. 7 V

4. In a device of the class described, a spike having a screw threaded stem and a head carried by said stem, said head being provided with a helically inclined under surface and with a helically inclined shoulder projecting'from said under surface, theinchnations of said surface and said shoulder being opposite in direction.

5. In a device of the class described, a 4o spike having a screw threaded'stem and a head carried by said stem, said head being provided with a helically inclined under surface and with a helically inclined shoulder projecting from said under surface, the inclinations of said surface and saidshoulder being opposite in direction, said surface having a portion thereof cut away to permit the continuation of said'shoulder.

6. In a device of the class described, spike having a stem and a head carried by 1 said stein, said head being provided with two helically inclined surfaces on its under side, said surfaces being inclined in opposite directions. V I

7. In a device of the class described, a spike having a screw threaded stem and a head carried by said stern, said head being provided with two helically inclined under surfaces, one of in the same direction and having substantially the same pitch as said thread, and the other surface being inclined in the opposite direction.

8. In a device of the class described, aspike having a screw threaded stem and a head carried by said stem, said head being provided with a part having a helically inclined under surface, said surface being inclined in the same direction as the thread of said stem;

said surfaces being inclined In testimony whereof I have subscribed my name. I a V DANIEL L. BBAINE.

-Witnesses I HENRY A. PARKS, MAURICE 'Bo'r'roN.

five cents each, by addressing the (Commissioner of Eatents, Washington, D. G. 

